Book drill



(No Model.) 2- Sheets-Sht 1.v

A. W.'&'-"z. W. DAW.

BOOK DRILL. No. 389,740. Patented Sept. 1 1888.

FIG].

(No Model.) 2 SheetsSheet 2.. A. W. & Z. DAW. ROCK DRILL.

No.389f740. Patented Sept. 18, 1888..

. W fi 15 {Figure} L1ke.let rs're resent silnilarpe rts in all" BERTWILLIAMS; \DAW "AND 'ZV'A oHARIIAs WILLIAMS ,DAW, or AAMDALS i PATENT.OF ICE;

- o BERvo msK FsE, o REm nn n-KEN, NORWAY.

- I Rock ng-LL;

. SEEJ IPIZ ECATION forming-paredBettexs- PetentNot389,740, datedSeptember 18 1588. s pucatios'finid hu -11st 131 887. Serial no.fl-lfigSOi. (no m dem. PatontecltinfinglunllAugust ,1837,1(QQJ33Qsingilat' 'fiekzinitials Kobbemoerkiskafse, ()vre Thelenialrkeminthe'Kingdom of Nomvay,ha\7e;

' "i nvented 6 d; fl 'seful Improvements 7 in by teziinorf sir; and isillustrated in the are dramasmetown, v g s ual un vi i ied i n'tlie;cylinder-andact in; 'oo'nj unction with ,ssagesz Zg form ed in thestuffing- Q" boxesateadhyend and 'thepa'ssages i M" in I thejvahie. ,V.Tas liereine fter described v The I iith'rougliwhichitwvorksfisthelhollowspace Bei itkn'o H n ftha'tflwe ALBERT. WILLI S.

7],; communicating. with I passage M,'.-which leads tothe lower orforwardend of small eyl-l ihderC', in" W'hichthe valveepistoui I works.The part Riearriesa, rifled nut,:N, for thepur- "pose of i-otatingjthe.drillt asqhereinafter de scribed. Onth'epai t Ri' of the piston-rod isatiug the. feeding 'de'viee,-as hereinafter described. j f

The Valve-V is oi'ordinary construction, and is connected by arenioyahle'bar, 13', to the two i ,srnail pistons P and P respective] y,working 'in't he sin'all ylihders O;end'C,.fori'11ed.i u the pistonsereti-ctuated lay-'leiraotSteani alter nately .admitt'ed to aud'ex'heusteyl from such small eylinqers frorn the. main cylinder 6 by thepassages M. and M inflt he'pa rtsR and. R"

:of the piston-rod, and the pzis'sages1M and M,

at. each end of the valve;ehest,through the hollow spacesZ and T'Zinjthe stuflinghoxes 'these passages being broughtlinto communi cationat oertainfportions of the stroke of the piston." H e. v w

The action is as l'ollowsz' The piston Phat/ j'shown inFig. 1, air ors'teamis admitted-from l eylinderO through passagesM", Z,, and M to therear side ol'the valve-piston 'P, the pas; o

"sage'M in the piston -rod R bei n g soarranged as to-establish thenecessary communication when the piston hasnea'rly completed itsbackward.

stroke "Thesteain or ain'actingon the rear of 'va-lv'e-pistonf ',movesit to the positionjshown v -iiiFig, 2, when-the valve V. (having been w5- ;moved with lhe-pistonsl P input-the space below the'drill-pisto'n Ijo'pen to the ex} hgust, through pessegeslilland E, and. the -passageiMbeingistill iu eommunication with? .sueh space below the dr ill -jpistonP, will alsobe 'openfto the-exhaust, and the steam will; 7 d thus,beef-exhausted from;hehihdqelirgiston -l .P wgh Pa M ZLM", rend--thesame time, asthe inoizexnent bf the yalve Ywill haveop'enedthegm'ssegelfftothe steam .orai'r infthe-va1ve;ehest, the teamorair-will I pass toa'nd aet gponthe rea'rfof drill-piston P P andeffeot theti w-n 01 ;R V;Q1King str0ke of the.

. -1s' ing arrived at its full backwardstroke; as!" drill, such movementcutting 0H both cylinders G and 0 both from steam and exhaust until thedownward stroke of the drill is nearly completed, when passage M inpiston-rod R will establish communication (through passages Z M) betweenthe space which there will then be above the piston P and the rear ofvalve-piston P, and the steam or air passing from such space in cylinder0 will act on piston P, and so reverse valve V, returningit again to theposition shown in Fig. 1, thus putting the space above piston P and atthe rear of piston 1? open to the exhaust and admittingsteam throughpassage I to act upon the under side of piston P, and so efi'eet thereturn-stroke, thus bringing the whole of the parts back to the positionshown in Fig. 1, when the action above described will be repeated.

The rotation of the drill is effected by means of the nut N, which isexternally rifled or provided with helical projections engagingcorresponding grooves formed in the'inside of bush Y, so that as nut N,which is mounted on the piston-rod R, reciprocates with the latter itwill cause the bush to make a partial rotation during the forward strokeof the drill. As the bush Y is prevented from rotating in the oppositedirection during the backward stroke of the drill by means. of anarrangement of pawls Fengaging the ratchet-wheel I", mounted on bush Y,as shown in Fig. 8, so as only to permit the latter to revolve in onedirection, it follows that during the backward stroke of the drill therifled nut N will be caused to make a partial rotation, carrying with itthe pistor.-rod and drill, whereas during the for ward stroke, the.pawls F being free toslip over the teeth of the ratchet-wheel U, (theinertia of which and the bush Y is more than counterbalanced by that ofthe piston and its rod and the drill,) the bush Y will be caused to turninstead of the piston-rod. Thepawls F are acted upon by springs toinsure. their proper engagement with the teeth of ratchetwheel U". r

In order to avoid all chance of the breaking of the pawls E, or of theteeth of ratchet-wheel U should the drill encounter any obstruction toits rotation, the ratchet-wheel U is mounted on a conical seat formed onbush Y, arid is held fast thereon by the friction of thecontact-surfaees caused by the action ofa powerful spring, S. If only aslight or no obstruction presents itself to the rotation of the drill,the action of the spring will cause the ratchetwheel U to act as thoughit were keyed to the bush and prevent its rotation during the backwardstroke; but should'any considerable opposition present itself, thestrain will cause the bush to slip within the ratehetwheel U, and thusprevent all chance of the pawls F or the teeth of ratchet-wheel U beingbroken.

The part R" of the piston-rod is surrounded by a hollow cylindrical rod,B, in which the part R can revolve, but to which latter the rod B issecured by a nut, B, so that it is caused to reciprocate with thepiston-rod. This rod B is rifled or provided with external helicalprojections engaging corresponding grooves in the inner surface of theboss of a crank, K, mounted loosely on the rod. To the arm of crank K apawl, F, (acted upon by a spring,) is pivoted, and engages the teeth ofa ratchet-wheel, U, to the hub of'which a wheel, \V, is secured. Thewheel \V gears with a pinion, \V, secured to the feed screw Q,workingthrough nuts N, fixed to the slide or saddle S, on which the machine ismounted.

The rod B is prevented from rotating by meansot'alongitudinalslotrunning thegrcater portion of its length, with whicha bar, G, engages, such bar passing through the hearing L and easing E,to which latter it is secured, as shown in Fig. 5.

On the completion of the forward stroke of the piston P the pawl F isforced into engagement with one of the notches or teeth of ratchet-wheelU, and locks same, so that on the return-stroke the ritling of rod B,imparting a partial rotation to crank K, will cause the pawl F to imparta similar movement to wheel U, and through wheel W, gearing with pinionW, such movement will be transmitted to feed screw Q, and by causing itto work through the nuts N on saddle S thus advance or feed the machineforward. In consequence of this advance the next forward stroke of thepiston will not be a full-stroke, and will notbe a full-stroke againuntil thelength of the forward movement has been bored by thedrill, anduntil this takes place the pawl F cannot enter a fresh notch or tooth ofwheel U, but will move freely backward and forward over such wheelwithout actuating same. Immediately that the piston regains itsfull-stroke the pawl will engage a fresh notch or tooth, and a furtheradvance will be given to the machine.

The pawl F, as shown in Fig. 4, has a head,

F capable of sliding freely on the curved bar or oke J as the crank Kreciproeatcs. From bar J two arms, J, extend,,and are mounted oneccentrics on spindle J", mounted on the casing, so that by turning saidspindle oy means of the crank or handle J atone end the pawl will beraised clearof ratchetwhc'cl U and permitof thedrill bcingscrewed backon saddle S, after having been advanced to the full extent of the feed.The end of feed-screw Q is fitted with erank-hamile I,to enable same tobe turned by hand for the parpose of moving the machine back ward orforward on the saddle S, as required, the pawl F being first raisedclear of ratchet-wheel U, as above described.

Two circular bars, Q, running parallel with the feed-screw Q, workthrough the saddle S, and are keyed firmly to the body of the machine,and further held bynuts, as shown in Fig. 6.

To prevent excessive wear on the feed-screw Q and nuts N, the former isfitted with a strong spring}. S", at its lower end, as shown'in-Figsi'landdp" I In action the machine isattached to a' car riagez'orcolumn by the'saddlearn B. Thedrillorborer D'has. a projection, D, (seeFigs. 1 and 7,).forfixing it in its socket in the-lower endofj thepiston-rod'R, the

' socket having a longitudinal slot, from. the end .;ofwhichiatransverse slot 1eads,-thelatter be- "The'projectidn D on drill Dis first inserted .in the longitudinaljslot in the socket and forcedtothe end .of same, when by a twist" being imparted 'to the drill theprojection is.

z caused to enter the transverse "groove, and,

- moving'o'ver the inclined plane thereof forces,

' .the end of the .d'rillor' borer tightly against the bottom of thesocket; The direction of the transversegroove is opposed to'that in anwhichf the drillis caused torotate, so-that the .l'attermay haveno'tendency to loosen in its socket-.""'

' ,Theup-per part of cylindenj'C is turned to receive the bearings-L andL',the latter being z5"tur.nedjtofit same, and'being fixedjby screwsitothelcasingE of the machine. The stuflingboxes are eachclosed byannular plates'T, (see Fig. 1,) the packing O and the'plates T fitting'R'compactly: on each'other with the spaces 'Z 3o.and:Z: in the centers,from'feach of which a channel proceeds forplacingthe p assages'M and M",-respectively,,in communication there .with'. The "upper box is"finally closed and 1 the packing compressed by'the screw-nut L,5andthe-1ower box by the gland G. Y

The rifling of'nut N and bush Y, and also "lhato'f rod B and crank; K,,ca n ,be arranged ,"with the projections on either part to enterthe-grooves in the other part. s Havingfully described our invention;what we desire to claim and secure by Letters Patent 1. The means foractuating the valve of rock'- drillsycons isting in arranging thefvalvebetween two pistons capable of reciprocating in.

. suitable cylindersprov-ided in the valve-chest, an from the outer endof each of which a passage leads through the stuffing-boxes or glandsol-the mai'ncylinder' into the latter, the'pas- 5o sage fromieachval'vepiston cylindergpassing' through the stufling-box at the oppositeendot the main" cylinder to that at which it is itself situated, thensual'passa'ges for the admission and exhaust of steam oriair to'andfrom the main. cylinder; being arrangedv between the cylinders,

ports or passages leading to the valve-piston and two separate passagesformed in the-rod of the main or drill piston, and each -serving tocontrol the supplyand' exhaust of substantially, as specified.

inder,and also with one end of one of two cylinders in which arearranged pistons carrying between them'the valve for actuating the main4 v piston of the drill, substantially as specified. fro'ing in the formof part of a screw-thread 3. The combination of parts for-efiecting therotation of .the drill-piston and its rod at each rifled nut, Ng'rigidlyfixed to the part B- of the piston-rod and engaging an internally-rifledbushor sleeve, Y, capable of a circular movement, but prevented-frommoving longitudi- .backward'stroke, consisting in an externally nallyinthe casing E, and having an external conical surface forming the seatfor a ratchet wheel, U,whi'ch is forced to such seat by a spring, S,permitting the bush Y- to turn thereinjn the case of any unusualobstructioh during the backward stroke, suitable pawlsj,

being arranged to engage suchwheel and pre-' vent its rotation duringthe backward stroke,

4. The arrangement of mechanism for feed ing thedrill forward as thework progresses,

consisting in mounting on the piston-rod 0t thedrilla hollow rifled rodprovided with a longitudinal groove,with which a bolt-projectf 'ingthrough-the drill-casing engages, so as to prevent its rotation on thepiston-rodjwh'fle allowing it to "reciprocate therewith, such rifled rodengaging the boss of acrank mounted so as to be capable of a circularrocking movement thereon, and upon thearm of which is pivoted apawlwhich engages aratchet-wheel, to the boss of which a toothed wheel iscqnnectedand gears with a pinion fixed. to the feed-screw, workingthrough a n'nt or nuts carried by the slide or saddle on which the wholemachine is mounted, all arranged andoperating substantially asspecified. '5.'The means for disengaging the pawl F- from ratchet-wheelII when required to move 7' the drill in relation to theslide or'saddleby to;

hand, such means consisting in theshaft J, mounted so, that it can --berocked in .s'uitable bearings, and provided ,with eccentrics engagingthe arms'Jof'a curved barior yoke, J,:

'onwhichan arm-or head, F,'of the pawl F 'isjfree to slide, all arrangedand operating snbstantially as specified;j

ALBERT WILLIAMS .DAW..

."- Wit'nesses:

J AN. G. HELMER,

measures W ILLEAMS "DAW.

